.spinner {
    width: 40px;
    height: 40px;
    display: block;
    position: fixed;
    top: calc( 50% - ( 40px / 2) );
    right: calc( 50% - ( 40px / 2) );
}

.double-bounce1, .double-bounce2 {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background-color: #333;
    opacity: 0.6;
    position: absolute;
    top: 0;
    left: 0;
    -webkit-animation: sk-bounce 2.0s infinite ease-in-out;
    animation: sk-bounce 2.0s infinite ease-in-out;
}

.double-bounce2 {
    -webkit-animation-delay: -1.0s;
    animation-delay: -1.0s;
}

@-webkit-keyframes sk-bounce {
    0%, 100% {
        -webkit-transform: scale(0.0)
    }

    50% {
        -webkit-transform: scale(1.0)
    }
}

@keyframes sk-bounce {
    0%, 100% {
        transform: scale(0.0);
        -webkit-transform: scale(0.0);
    }

    50% {
        transform: scale(1.0);
        -webkit-transform: scale(1.0);
    }
}
